1. A head for an oral care implement comprising:
a mounting surface, and
at least one tuft extending from the mounting surface,
the tuft comprising a first group of filaments and at least a second group of filaments,
the first group of filaments being surrounded by the second group of filaments,
the filaments of the first group having a longitudinal axis and a cross-sectional area extending in a plane perpendicular to the longitudinal axis, and the cross sectional area having a substantially circular shape with a first diameter, and
the filaments of the second group having a longitudinal axis and a cross-sectional area extending in a plane perpendicular to the longitudinal axis, and the cross sectional area having a substantially circular shape with a second diameter,
wherein the first diameter is smaller than the second diameter and wherein the first diameter is about 0.15 mm to about 0.16 mm, and the second diameter is about 0.17 mm to about 0.18 mm.
2. The head of claim 1, wherein the filaments of the first group have a first length and the filaments of the second group have a second length different from the first length, whereby there is a difference in length between the first length and the second length.
3. The head of claim 2, wherein the first length is greater than the second length.
4. The head of claim 2, wherein the difference in length is from about 1.1 mm to about 1.9 mm.
5. The head of claim 1, wherein the tuft has a longitudinal axis and a cross-sectional area extending in a plane perpendicular to the longitudinal axis, and the cross sectional area has a substantially circular shape with a diameter of about 2.8 mm to about 3.2 mm.
6. The head of claim 1, wherein the first group of filaments has a longitudinal axis and a cross-sectional area extending in a plane perpendicular to the longitudinal axis, and the cross sectional area of the first group of filaments has a substantially circular shape with a diameter of about 0.8 mm to about 1.2 mm.
7. The head of claim 1, wherein at least some of the filaments of the first group andor at least some of the filaments of the second group are tapered and have a pointed tip.
8. The head of claim 1, wherein the tuft has a free end having a topography selected from the group consisting of a linear shape, a concave shape, a convex shape, a dome shape, or any combination thereof.
9. The head of claim 1, wherein the filaments of the first group differ from the filaments of the second group in at least one characteristic selected from the group consisting of bending stiffness, cross-sectional shape, material, texture, color, and any combination thereof.
10. The head of claim 1, wherein the at least one tuft is inclined relative to the mounting surface of the head at an angle (\u03b1) defined between the tuft and the mounting surface.
11. The head of claim 10, wherein the angle (\u03b1) is from about 45\xb0 to about 89\xb0.
12. The head of claim 10, wherein the at least one tuft is inclined in a direction that is substantially parallel to the longitudinal extension of the head.
13. The head of claim 10, wherein the head comprises at least a first tuft inclined in a direction towards a distal end of the head and at least a second tuft inclined in a direction towards a proximal end of the head.
14. The head of claim 1, wherein the tuft is attached to the head by a hot-tufting process.
15. The head of claim 1, wherein the first diameter is about 0.152 mm.
16. The head of claim 1, wherein the second diameter is about 0.178 mm (7 mil).
17. The head of claim 4, wherein the difference in length is from about 1.3 mm to about 1.7 mm.
18. The head of claim 18, wherein the difference in length is about 1.5 mm.
19. The head of claim 11, wherein the angle (\u03b1) is from about 70\xb0 to about 80\xb0.
20. An oral care implement comprising the head of claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of treating a subterranean formation comprising the steps of:
providing a servicing fluid comprising carbon dioxide and a hydrocarbon blend, wherein the hydrocarbon blend comprises at least about 65% hydrocarbons having from seven carbons (C7) to ten carbons (C10); and
placing the servicing fluid into the subterranean formation.
2. The method of claim 1 wherein about 85% of the hydrocarbon blend comprises hydrocarbons having eight carbons (C8), hydrocarbons having nine carbons (C9), or a mixture of hydrocarbons having eight carbons (C8) and hydrocarbons having nine carbons (C9).
3. The method of claim 1 wherein the hydrocarbon blend has a Reid Vapor pressure below about 2 psi.
4. The method of claim 1 wherein the hydrocarbon blend comprises less than about 1% hydrocarbons having more than ten carbons (C10).
5. The method of claim 1 wherein the hydrocarbon blend comprises less than about 1% hydrocarbons having fewer than seven carbons (C7).
6. The method of claim 1 wherein the servicing fluid further comprises a gelling agent present in an amount in the range of from about 0.1% to about 2.5% by weight of the hydrocarbon blend.
7. The method of claim 6 wherein the gelling agent is selected from the group consisting of ferric iron polyvalent metal complexes of alkylphosphonic acid esters, aluminum polyvalent metal complexes of alkylphosphonic acid esters, and combinations thereof.
8. The method of claim 6 wherein the gelling agent is selected from the group consisting of ferric iron polyvalent metal complexes of orthophosphoric acid esters, aluminum polyvalent metal complexes of orthophosphoric acid esters, and combinations thereof.
9. The method of claim 6 wherein the gelling agent is selected from the group consisting of ferric iron polyvalent metal complexes of unsymmetrical dialkylphosphinic acids, aluminum polyvalent metal complexes of unsymmetrical dialkylphosphinic acids, and combinations thereof.
10. The method of claim 1 wherein the servicing fluid further comprises a LPG fluid.
11. The method of claim 1 wherein the servicing fluid further comprises particulates.
12. The method of claim 1 wherein the servicing fluid further comprises a delayed gel breaker.
13. The method of claim 1 wherein the hydrocarbon blend comprises less than about 1% hydrocarbons having fewer than seven carbons (C7), about 5% hydrocarbons having seven carbons (C7); about 44% hydrocarbons having eight carbons (C8); about 43% hydrocarbons having nine carbons (C9); about 8% hydrocarbons having ten carbons (C10); and less than about 1% hydrocarbons having more than ten carbons (C10).
14. The method of claim 13 wherein the hydrocarbon blend comprises substantially no hydrocarbons having more than eleven carbons (C11).
15. The method of claim 1 wherein the servicing fluid comprises from about 30 volume % to about 80 volume % carbon dioxide by volume of hydrocarbon blend.
16. A method of fracturing a subterranean formation comprising the step of placing a fracturing fluid comprising carbon dioxide and a hydrocarbon blend into the subterranean formation at a pressure sufficient to create at least one fracture therein wherein the hydrocarbon blend comprises at least about 65% hydrocarbons having from seven carbons (C7) to ten carbons (C10).
17. The method of claim 16 wherein about 85% of the hydrocarbon blend comprises hydrocarbons having eight carbons (C8), hydrocarbons having nine carbons (C9), or a mixture of hydrocarbons having eight carbons (C8) and hydrocarbons having nine carbons (C9).
18. The method of claim 16 wherein the hydrocarbon blend has a Reid Vapor pressure below about 2 psi.
19. The method of claim 16 wherein the hydrocarbon blend comprises less than about 1% hydrocarbons having more than 10 carbons (C10).
20. The method of claim 16 wherein the hydrocarbon blend comprises less than about 1% hydrocarbons having fewer than seven carbons (C7).
21. The method of claim 16 wherein the fracturing fluid further comprises a gelling agent present in an amount in the range of from about 0.1% to about 2.5% by weight of the hydrocarbon blend.
22. The method of claim 21 wherein the gelling agent is selected from the group consisting of ferric iron polyvalent metal complexes of alkylphosphonic acid esters, aluminum polyvalent metal complexes of alkylphosphonic acid esters, and combinations thereof.
23. The method of claim 21 wherein the gelling agent is selected from the group consisting of ferric iron polyvalent metal complexes of orthophosphoric acid esters, aluminum polyvalent metal complexes of orthophosphoric acid esters, and combinations thereof.
24. The method of claim 21 wherein the gelling agent is selected from the group consisting of ferric iron polyvalent metal complexes of unsymmetrical dialkylphosphinic acids, aluminum polyvalent metal complexes of unsymmetrical dialkylphosphinic acids, and combinations thereof.
25. The method of claim 16 wherein the fracturing fluid further comprises a LPG fluid.
26. The method of claim 16 wherein the fracturing fluid further comprises particulates.
27. The method of claim 16 wherein the fracturing fluid further comprises a delayed gel breaker.
28. The method of claim 16 wherein the hydrocarbon blend comprises less than about 1% hydrocarbons having fewer than seven carbons (C7), about 5% hydrocarbons having seven carbons (C7); about 44% hydrocarbons having eight carbons (C8); about 43% hydrocarbons having nine carbons (C9); about 8% hydrocarbons having ten carbons (C10); and less than about 1% hydrocarbons having more than ten carbons (C10).
29. The method of claim 28 wherein the hydrocarbon blend comprises substantially no hydrocarbons having more than eleven carbons (C11).
30. The method of claim 16 wherein the servicing fluid comprises from about 30 volume % to about 80 volume % carbon dioxide.